Revenue Recognition Revenue Recognition - Disaggregation of Revenue - By Segment (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Casino	$ 983	$ 390
Food and beverage	383	206
Rooms	367	247
Management fees	15	0
Reimbursed management costs	52	0
Total contract revenues	1,937	922
Other revenue	172	123
Net revenues	1,972	966
Entertainment [Member]
Entertainment and other	137	79
Other [Member]
Other revenue	35	44
Corporate and Other [Member]
Casino	58	8
Food and beverage	7	0
Rooms	1	0
Management fees	15
Reimbursed management costs	51
Total contract revenues	141	12
Net revenues	142	12
Corporate and Other [Member] \| Entertainment [Member]
Entertainment and other	9	4
Corporate and Other [Member] \| Other [Member]
Other revenue	1	0
Operating Segments \| Las Vegas, NV [Member]
Casino	262	196
Food and beverage	242	161
Rooms	280	215
Management fees	0
Reimbursed management costs	0
Total contract revenues	874	634
Net revenues	906	674
Operating Segments \| Las Vegas, NV [Member] \| Entertainment [Member]
Entertainment and other	90	62
Operating Segments \| Las Vegas, NV [Member] \| Other [Member]
Other revenue	32	40
Operating Segments \| Other U.S. [Member]
Casino	663	186
Food and beverage	134	45
Rooms	86	32
Management fees	1
Reimbursed management costs	1
Total contract revenues	924	276
Net revenues	926	280
Operating Segments \| Other U.S. [Member] \| Entertainment [Member]
Entertainment and other	39	13
Operating Segments \| Other U.S. [Member] \| Other [Member]
Other revenue	2	4
Intersegment Elimination
Casino	0	0
Food and beverage	0	0
Rooms	0	0
Management fees	(1)
Reimbursed management costs	0
Total contract revenues	(2)	0
Net revenues	(2)	0
Intersegment Elimination \| Entertainment [Member]
Entertainment and other	(1)	0
Intersegment Elimination \| Other [Member]
Other revenue	$ 0	$ 0

Revenues generated by casino operations. Also includes revenues generated by and derived from a hotel's, including cruise lines, gaming operations; likewise, such revenues may be derived from gaming operations that also are hoteliers.

Name:	us-gaap_CasinoRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Revenue from sale of food (prepared and cooked-to-order foodstuffs, as well as snack items) and beverages (bottled or on-tap alcoholic beverages, as well as nonalcoholic beverages like carbonated drinks, juices, energy/sports drinks, water, coffee, and tea).

+ References

+ Details

Name:	us-gaap_FoodAndBeverageRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

+ References

+ Details

Name:	us-gaap_ManagementFeesRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Revenue derived from the provision of short term lodging; it does not apply to lease or rental income. Includes hotel rooms, cruise revenue, and other revenue related to lodgings.

+ References

+ Details

Name:	us-gaap_OccupancyRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, after sales adjustments, returns, allowances, and discounts, of revenue classified as other.

+ References

+ Details

Name:	us-gaap_OtherSalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 45
-Section 45
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=68075638&loc=d3e60722-111653

+ Details

Name:	us-gaap_ReimbursementRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

+ Details

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

+ Details

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount before allowances and discounts of service revenue classified as other.

+ References

+ Details

Name:	us-gaap_SalesRevenueServicesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_ProductOrServiceAxis=czr_EntertainmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=czr_OtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=czr_LasVegasNVMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=czr_OtherU.S.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: